Thanks for the clarification.
Yeah, pihole used to work for months without problems, but since pihole 5, mine stops answering requests on every Sunday morning, as described in this topic:
https://discourse.pi-hole.net/t/every-sunday-at-4am-pi-hole-stops-responding-to-dns-queries/
I still have this problem after I updated to the latest version (Pi-hole v5.1.2 Web Interface v5.1.1 FTL v5.2.), and last week I decided to comment out the "pihole updateGravity" line from /etc/cron.d/pihole.